Portable heater



FIG. 1 is a perspective view of the top, front and left side of aportable heater showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a rear view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a perspective view thereof in use condition, with the brokenline showing being for illustrative purposes only and forming no part ofthe claimed design.

The ornamental design for a portable heater, as shown and described.